docs: def create_from_request_pdu(pdu):
          """ Create instance from request PDU.
  
          :param pdu: A response PDU.
          """
          _, address, value = \
              struct.unpack('>BH' + conf.MULTI_BIT_VALUE_FORMAT_CHARACTER, pdu)
  
          instance = WriteSingleRegister()
          instance.address = address
          instance.value = value
  
          return instance